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6.3 Latch Function
6
FUNCTIONS
POINT
The latch range of the file register (ZR), extended data register (D), and extended
link register (W) can be set in the Universal model QCPU.
The data outside the latch range is cleared by powering the programmable
controller OFF ON or performing the reset operation of the CPU module.
After selecting "Use the following file." and setting the capacity of the file register
on the PLC file tab of PLC parameter, set the latch range of the file register (ZR),
extended data register (D), and extended link register (W). (For the extended data
register (D) and extended link register (W), assign a part of the file register area.)
If "Use the same file name as the program." is selected on the PLC file tab of PLC
parameter, the latch range of the file register (ZR), extended data register (D), and
extended link register (W) cannot be set. (All data in the file register is latched.)
When switching the file register file to be used with the QDRSET instruction, the
latch range setting of the file register will be invalid. After switching, regardless of
latch range setting, whole range of file register can be held without power supply.
Figure 6.5 Latch range setting of file register (ZR), extended data register (D), and extended link
register (W)
The number of file register points set
on the PLC file tab of PLC parameter is displayed.
The latch range is set.
